I was having problems with the egr valve causing the engine to buck when I was in tow/haul.
In reading some of the comments I concluded that it wouldn't hurt to unplug the egr valve.
I took it for a spin and everything ran good. No check engine light.
Put the transmision in tow/haul and the shift pattern increased 500 RPM.
Normal shift was 1500+ now it is 2000+

ANY IDEAS ?

 

i belive its suppose to do that i have an 03 and it does it. Always has

 

thats what tow/haul is for. My T/H shifts at like 2500, but i have custom tunes.

P.S are you talkinf full throttle or normal driving?

 

I'm talking normal driving. It didn't shift that high until I unpluged the EGR valve.

THANK YOU

 

It should. The tow/haul on these is pretty aggressive and keeps the torque converter locked up more. It's to prevent it from hunting for gears and getting hot when towing.

 

THANKS FOR THE HELP